MdePkg/Library/BaseLib/Ia32/Mwait.c

   1 /** @file
   2   AsmMwait function
   3
   4   Copyright (c) 2006, Intel Corporation<BR>
   5   All rights reserved. This program and the accompanying materials
   6   are licensed and made available under the terms and conditions of the BSD License
   7   which accompanies this distribution.  The full text of the license may be found at
   8   http://opensource.org/licenses/bsd-license.php
   9
  10   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12
  13 **/
  14
  15 #if _MSC_EXTENSIONS
  16
  17 UINTN
  18 EFIAPI
  19 AsmMwait (
  20   IN      UINTN                     RegisterEax,
  21   IN      UINTN                     RegisterEcx
  22   )
  23 {
  24   _asm {
  25     mov     eax, RegisterEax
  26     mov     ecx, RegisterEcx
  27     _emit   0x0f              // mwait
  28     _emit   0x01
  29     _emit   0xC9
  30   }
  31 }
  32
  33 #endif